Buffer.



No. 949,189. PATENTE) APR. 2, 1997.

J. F. BENNETT & J. MASTIN.

BUFFER. APBLIUATION FILED SEPT. 26, 195.

UNITE STATES RENT FICE.

JAINIES FREDERICK BENNETT, OF DRONFIELD, NEAR SIIEFFIELD, AND JOHN MASTIN, OF SHEFFIELD, ENGLAND.

BUFFER.

Specification of Letters Patent.

Patented April 2, 1907.

Application tiled September 26,1905. Serial No. 280.237.

Be it known that we, JAMES FREDERICK BENNETT, a subject of the King of Great Britain and Ireland, residing at Dronfield, near Sheffield, county of York, England, and JOHN MAsTIN, a subject of the King of Great Britain and Ireland, residing at Shefiield aforesaid, our postal address being Fosters Buildings, High street, Sheiiield, have invented a certain new and useful Improvement in Buers for RailwayT and Like Vehicles, of which the following is a specification.

The object of the invention is to dispense with the use of the springs usually employed to resist and cushion the force of impact and to substitute a cushion of air.

It consists in constructing a buffer in such a manner that there is always a cushion of air between the plunger and some point of resistance, such as the bottom of the bueroase or a fixed piston.

The annexed drawing illustrates one method of constructing a buffer for railwaycarriages and the like.

The drawing represents an elevation of a buffer, part being shown in vertical section.

It consists of a case A, a plunger B, and a fixed piston C, supported upon a rod, D secured to the base of the case by means of a nut E, preferably having a pin or split cotter E2 passed through it.

The piston C fits within the machined interior of the plunger and is provided with a leather cup F, which is carried within an annular recess in the piston and retained by a covering G, secured to the upper face of the piston. This leather cup prevents the air when under compression passing between the piston and the plunger, and so escaping, and if thought desirable an auxiliary metallic ring H may be placed inside the leather to keep it expanded. The air contained in the chamber I above the piston C will therefore be compressed when the plunger is forced inward and will constitute an air-cushion between the fixed and the movable parts.

In order to compensate for any condensation, variation in atmospheric pressure, or any loss by leakage, an air-passage J is provided in the side of the plunger, through which air can pass either to or from the interior, so as to restore the equilibrium.

Vhen pressure is removed from the compressed plunger, the air inclosed in the chamber I forces out the plunger to its normal position, and to aid this return action, a coiled spring K may be placed round the pistonrod D to act against a plate L, secured to the plunger and the bottom of the case. Metallic rings may be substituted for the leather cup F, and the piston may be supported upon a cast column forming part of the casing A but in all cases the cushioning medium in the buering device is air.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is-

A buffer for railway and other vehicles, consisting of an outer cylinder A, a looselyfitting plunger B to slide therein, and a piston O fixed to the cylinder and fitting interior of plunger, and capable of compressing the air contained therein, said plunger having an inlet therein and a metallic ring H in the cylinder bearing against the plunger B.

In witness whereof we have hereunto set our hands in presence of two witnesses.

JAlVIES FREDERICK BENNETT. JOHN MASTIN. I/Vitnesses:

LUTHER J. BARR, OHAs. N. DANinLs. 

